That seems like an overestimate. A quick search is showing up numbers more in the 15-20,000 km region, and that's comparing a large EV running off of a mostly fossil fuel grid against a much smaller ICE (i.e. quite a conservative estimate).
I think we're discussing the latter, where the upfront cost of the ice doesn't count because you already have it.
But generally we don't scrap old ones.
If you instead sell the old one to someone who drives an ICE car that gets worse mpg then that's a further benefit.